iOS开发bug消灭之：Generic parameter 'ResultType' could not be inferred

错误：Generic parameter ‘ResultType’ could not be inferred
swift版本：3.0
Xcode版本：8.0
错误原因：声明NSFetchRequest类型的时候没能指定其类型
错误源码：

        let fetchRequest:NSFetchRequest = NSFetchRequest(entityName: "Person")

修正源码：

        let fetchRequest:NSFetchRequest = NSFetchRequest<NSFetchRequestResult>(entityName: "Person")

简洁版：

        let fetchRequest = NSFetchRequest<NSFetchRequestResult>(entityName: "Person")

参考：

https://forums.developer.apple.com/thread/49162